Fluorcaphite

Fluorcaphite is a mineral with the chemical formula (Ca,Sr,Ce,Na)5(PO4)3F.[1] It is found in the Kola Peninsula in Russia.[2] Its crystals are hexagonal (dipyramidal class) and are transparent with a vitreous luster. It is light to bright yellow, leaves a white streak and is rated five on the Mohs Scale.[3] Fluorcaphite is radioactive.[1]

Fluorcaphite
General
CategoryMineral
Formula
(repeating unit)
SrCaCa3(PO4)3F
Strunz classification7/B.39-95
Crystal systemHexagonal
Crystal classDipyrimidal
Space groupP63 (No. 173)
Unit cell545.39 ų (Calculated from Unit Cell)
Identification
Formula mass671.38
ColourLight to bright yellow
Crystal habitPrismatic, Subhedral crystals
FractureSub-conchoidal
TenacityBrittle
Mohs scale hardness5
LusterVitreous
StreakWhite
DiaphaneityTransparent
Density3.60
Birefringence0.012

References


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